Effects of virtual Majorana neutrinos on charged Lepton Flavor Violation decays from a seesaw variant with radiatively induced light neutrino masses

Abstract

Lepton flavor violating decays ${\ell }_{\alpha }\to {\ell }_{\beta }\gamma$, being forbidden in the Standard Model framework, provide a sensitive probe for new physics. We study these processes in a seesaw variant in which small neutrino masses are generated radiatively. By analyzing the parameter space constrained by electroweak precision data, we investigate the correlation between these decays and non-unitary effects from TeV-scale heavy neutrinos. According to our results, $\mu \to e\gamma$ is the most promising channel for new physics searches, with the bound $|{\eta }_{\mu e}|\lesssim 10^{-6}$ obtained for non-unitary effects in this radiative seesaw variant. Our estimations of $\mathcal{B}\mathcal{R}\left(\mu \to e\gamma \right)$, which depends on the mass of the heavy neutrinos, shows that both current and future experimental facilities might be sensitive to these effects.

18 pages, 12 figures. References added, typos corrected, discussion added, main results unchanged. Version accepted in JPhysG

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